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For Worcester's five high schools, White estimated the cost of installing metal detector systems would run from $73,000 to $91,250. He noted given the school populations, four or five units would likely be needed to move students through in the morning. One handheld wand per unit is also included in the price.
In 1925 he applied for, and was granted, the first patent for a metal detector. Although Gerhard Fischer was the first person granted a patent for a metal detector, the first to apply was Shirl Herr, a businessman from Crawfordsville, Indiana. His application for a hand-held Hidden-Metal Detector was filed in February 1924, but not patented until July 1928.